实现Viewpager切换界面导航栏水波纹动画效果

package com.cvte.demo.mesh; import android.graphics.Path; import android.graphics.PathMeasure; import android.util.Log; /*add by liyun 20150327 add InhaleRightMesh*/ public class InhaleRightMesh extends Mesh { private Path mRightFirstPath; private Path mRightSecondPath; private PathMeasure mRightFirstPathMeasure; private PathMeasure mRightSecondPathMeasure; public InhaleRightMesh(int width, int height) { super(width, height); mRightFirstPath = new Path(); mRightSecondPath = new Path(); mRightFirstPathMeasure = new PathMeasure(); mRightSecondPathMeasure = new PathMeasure(); } @Override public void buildPaths(float endX, float endY) { if (mBmpWidth <= 0 || mBmpHeight <= 0) { throw new IllegalArgumentException( "Bitmap size must be > 0, did you call setBitmapSize(int, int) method?"); } mRightFirstPathMeasure.setPath(mRightFirstPath, false); mRightSecondPathMeasure.setPath(mRightSecondPath, false); float w = mBmpWidth; float h = mBmpHeight; mRightFirstPath.reset(); mRightSecondPath.reset(); mRightFirstPath.moveTo(w, h/2-10); mRightSecondPath.moveTo(w, h/2+10); mRightFirstPath.quadTo((7*endX) / 4, 10, (3*endX)/2, 5); mRightSecondPath.quadTo((7*endX) / 4, h-10, (3*endX)/2, h-5); mRightFirstPath.quadTo((5*endX) / 4, 10, endX, endY-4); mRightSecondPath.quadTo((5*endX) / 4, h-10, endX, endY+4); } @Override public void buildMeshes(int timeIndex) { if (mBmpWidth <= 0 || mBmpHeight <= 0) { throw new IllegalArgumentException( "Bitmap size must be > 0, did you call setBitmapSize(int, int) method?"); } mRightFirstPathMeasure.setPath(mRightFirstPath, false); mRightSecondPathMeasure.setPath(mRightSecondPath, false); int index = 0; float[] pos1 = {0.0f, 0.0f}; float[] pos2 = {0.0f, 0.0f}; float firstLen = mRightFirstPathMeasure.getLength(); float secondLen = mRightSecondPathMeasure.getLength(); float len1 = firstLen / mHorizontalSplit; float len2 = secondLen / mHorizontalSplit; float firstPointDist = timeIndex * len1; float secondPointDist = timeIndex * len2; float firstDist = firstLen; float firstSplitDist = firstDist / mHorizontalSplit; float secondDist = secondLen; float secondSplitDist = secondDist / mHorizontalSplit; for (int x = 0; x <= mHorizontalSplit ; x++) { mRightFirstPathMeasure.getPosTan(x * firstSplitDist + firstPointDist, pos1, null); mRightSecondPathMeasure.getPosTan(x * secondSplitDist + secondPointDist, pos2, null); float fx1 = pos1[0]; float fx2 = pos2[0]; float fy1 = pos1[1]; float fy2 = pos2[1]; float dy = fy2 - fy1; float dx = fx2 - fx1; for (int y = 0; y <= mVerticalSplit; y++) { float fx = dx * y / mVerticalSplit; float fy = dy * y / mVerticalSplit; mVertices[index * 2 + 0] = fx + fx1; mVertices[index * 2 + 1] = fy + fy1; index += 1; } } } public Path[] getPaths() { return new Path[]{mRightFirstPath, mRightSecondPath}; } }